SCSI Commands

LOG SELECT Command (4Ch) (continued)

Table 5–16 LOG SELECT Command Descriptor Block - Field Descriptions

Field Name

Description

 

 

PCR

Parameter Code Reset. If this bit is set to 1 and the parameter list length is set to 0,

 

all accumulated values of page codes 2, 3, and 32 are set to 0 and all threshold

 

values are set to default. If PCR is set to 1 and the parameter list length is set to a

 

non-zero value, the command terminates with a CHECK CONDITION status with

 

sense key of ILLEGAL REQUEST and an Additional Sense Code (ASC) of INVALID

 

FIELD IN CDB.

SP

Save Page. Not supported, must be set to 0. If for some reason the Save Page bit is

 

set, the command terminates with a CHECK CONDITION status with a sense key of

 

ILLEGAL REQUEST and an ASC of INVALID FIELD IN CDB.

PC

Page Control. This field defines the type of parameter values to be selected:

 

PC Type of Parameter Values

 

00b - Current Threshold Values

 

01b - Current Cumulative Values

 

10b - Default Threshold Values

 

11b - Default Cumulative Values

 

All of these types of values are changeable using LOG SELECT.

 

When the PC field is set to 00b or 01b and the Parameter List Length is set to 0, the

 

command terminates with a CHECK CONDITION status, Sense Key of ILLEGAL

 

REQUEST, and ASC of INVALID FIELD IN CDB. This occurs because modification of

 

Current Threshold Values and Current Cumulative Values is not supported.

 

When the PC field is set to 10b and the Parameter List Length field is set to 10b,

 

then all Current Threshold Values are reset to the Default Threshold Values. This is

 

equivalent to no change, since Threshold Values cannot be modified.

 

When the PC field is set to 11b and the Parameter List Length field is set to 0, then

 

all Current Cumulative Values are reset to the Default Cumulative Values. This is

 

equivalent to clearing all log pages that can be cleared.

Parameter

This field specifies the length, in bytes, of the LOG SELECT parameter list to be

List Length

transferred from the initiator to the target during the DATA OUT phase. A parameter

 

list length of 0 indicates that no data is to be transferred. This condition is not

 

considered an error.

 

 

Quantum DLT 7000 Tape System

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Quantum Instruments DLT 7000 manual LOG Select Command 4Ch, LOG Select Command Descriptor Block Field Descriptions, Pcr
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